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There are various sites which provide SEO report of your or any other site. On those site you have to just enter url, they will provide complete analysis of the url like backlinks, social networking accounts, page rank, page size, backlinks, errors and many more.. one such site is woorank, superseo and so on..

SEO SpyGlass is a popular tool for finding competitor backlinks and their in-depth analysis.
I'm following Link-Assistant's blog and they announced the biggest backlink index to be launched in SEO SpyGlass - http://www.link-assistant.com/news/backlink-index.html. Sounds good to me.